I suggest the Bullseye Black Opal Gold Iridized Thin Glass, available at Delphi Glass. Delphi has this color and many more to choose from. Here's more:

Unlike other iridized glass that offer a rainbow effect, this glass has a consistent gold colored sheen. Bullseye's iridescent thin sheets are ideal for delicate kiln work and precise additions to layered works of jewelry. Its unique matte iridized finish is designed to withstand the high heat of fusing. Glass is safe for food bearing surfaces. Thin-rolled is 2 mm thick and tested compatible for fusing. 90 COE.

Please see my other recommendations. If you have more questions, ask IMShopping!